/Engine/Plugins/Experimental/MeshModelingToolsetExp/Source/MeshModelingToolsExp/Public/Sculpting/MeshSculptUtil.h
Precalculate IndexSetTemp for the modified TriangleROI, the indices will either be overlay normal element IDs, or vertex IDs
namespace UE { namespace SculptUtil { void UE::SculptUtil::PrecalculateNormalsROI ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) * Mesh, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & TriangleROI, [FUniqueIndexSet](API\Runtime\GeometryCore\Util\FUniqueIndexSet) & IndexSetTemp, bool & bIsOverlayElementsOut, bool bForceVertex ) } }